DxTree: a visual analytics tool for hierarchical representation of disease cohort counts for clinical trials. - Mingwei Zhang; Zongzhi Liu; Meng Ma; Kyeryoung Lee; Yun Mai; Scott Jones; Chris Gilman; Ying Ru; Matthew Deitz; Yunrou Gong; Xiang Zhou; Krish Ghosh; et al. (AMIA, 2020)